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ESP32-Serial กับ Nano

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การทดสอบการเชื่อมต่อ  ESP32 กับ Nano
สำหรับฝั่ง ESP32  ให้ใช้งาน  hardware serial port  RX2, TX2 หรือ  RX1, TX1 ได้เลย  ในกรณีนี้จะใช้ RX2, TX2
และจะทำการทดสอบ  FS200-SHT1  sensor วัด temp  humid ไปพร้อมๆ กัน

โดยการเชื่อมต่อ
ESP32         Nano

  • GND            GND
  • RX2            D11
  • TX2             D10

กำหนดขา  RXD บน ESP32

#define RXD2 16
#define TXD2 17

และใน void setup()  ประกาศใช้

void setup()
{
delay(10000);
Serial.begin(9600); Serial2.begin(4800, SERIAL_8N1, RXD2, TXD2); // original 8N1
Serial.println("Serial Txd is on pin: "+String(TX)); Serial.println("Serial Rxd is on pin: "+String(RX));
....

สำหรับการเรียก  ขอข้อมูลจาก Nano  ใช้โค้ดส่วนนี้

void serial_loop()
{
Serial.println("Please wait Serial..");
/// #1
  while (a == "") {
    Serial2.print("Input1"); // ส่งคำขอ Input1 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 1 ");Serial.println(a);
  data1 = String(a);
  delay(1000);
  a="";
///#2
  while (a == "") {
    Serial2.print("Input2"); // ส่งคำขอ Input2 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 2 ");Serial.println(a);
  data2=String(a);
  a="";
///#3
    while (a == "") {
    Serial2.print("Input3"); // ส่งคำขอ Input3 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 3 ");Serial.println(a);
  data3 = String(a);
  delay(1000);
  a="";
///#4
  while (a == "") {
    Serial2.print("Input4"); // ส่งคำขอ Input4 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 4 ");Serial.println(a);
  data4=String(a);
  a="";
}

และเป็นโค้ดรวม

/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////
//Libraries
#include <Arduino.h>
#include <Wire.h>
#include <WiFi.h>
/*
 * There are three serial ports on the ESP known as U0UXD, U1UXD and U2UXD.
 *
 * U0UXD is used to communicate with the ESP32 for programming and during reset/boot.
 * U1UXD is unused and can be used for your projects. Some boards use this port for SPI Flash access though
 * U2UXD is unused and can be used for your projects.
 *
*/
#define RXD2 16
#define TXD2 17
/////
#include <math.h>
//======
#include <Adafruit_Sensor.h>
#include <DHT.h>  // กรณีนี้ต้องใช้คู่กันกับ  DHT_U.h
#include <DHT_U.h>
#define DHTPIN 6 // Pin which is connected to the DHT sensor.
// Uncomment the type of sensor in use:
//#define DHTTYPE           DHT11     // DHT 11
#define DHTTYPE           DHT22     // DHT 22 (AM2302)
//#define DHTTYPE           DHT21     // DHT 21 (AM2301)
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;
////
char* host = "xxxxxxx.com";
char* code = "********";
char* dID = "******";
float dustDensity = 35;
String response ="0";
String response_c = "0";
String a ;
float temp_0 = 0;
float tempF_0 = 0;
float humid_0 = 0;
float vHumidity = 0;
float vTemperature = 0;
String data1 ;
String data2 ; // standard
String data3 ;
String data4 ;
float data5 = 0;
float data6 = 0;
float data7 = 0;
float data8 = 0;
float data9 = 0;
float data10 = 0;
float data11 = 0;
float data12 = 0;
float data13 = 0;
float data14 = 0;
float data15 = 0;
float data16 = 0;
float data17 = 0;
float data18 = 0;
float data19 = 0;
float data20 = 0;
float temperatureC = 0;
float temperatureF = 0;
int counter = 1;
int sentcount = 0;
/////////////////////////////////////////////////////////////////////////////
void master_i2c_setup() {
  Wire.begin();
  Serial.println("I2C Master Demonstration");
}
/////////////////////////////////////////////////////////////////////////////
// Arduino setup function.
///////////////
const char* ssid      = "Arsenal2019_2.4G";
const char* password  = "kb75699212";
const char* ssid1     = "Arsenal2019_2.4G";
const char* password1 = "kb75699212";
const char* ssid2     = "Arsenal2019_2.4G";
const char* password2 = "kb75699212";
// Helper functions to print a data value to the serial monitor.
void WiFisetup()
{
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid1);
  WiFi.begin(ssid1, password1);
  delay(1000);
  if (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Failed to connected and WiFi setup ");
    WiFi.begin(ssid2, password2);
    delay(1000);
    if (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.println("Failed to connected and WiFi setup ");
    }
    else{
       ssid = ssid2;
       password = password2;
    }
  }
  else{
  ssid = ssid1;
  password = password1;
  Serial.println("");
  Serial.println("WiFi connected OK");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  }
}
///
void AM2302_setup() {
  dht.begin();
  Serial.println("DHTxx Unified Sensor Example");
  // Print temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Temperature");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" *C");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" *C");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" *C");
  Serial.println("------------------------------------");
  // Print humidity sensor details.
  dht.humidity().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Humidity");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println("%");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println("%");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println("%");
  Serial.println("------------------------------------");
  // Set delay between sensor readings based on sensor details.
  delayMS = sensor.min_delay / 1000;
}
///
void setup()
{
  delay(10000);
  Serial.begin(9600);
  Serial2.begin(4800, SERIAL_8N1, RXD2, TXD2); // original 8N1
  Serial.println("Serial Txd is on pin: "+String(TX));
  Serial.println("Serial Rxd is on pin: "+String(RX));
///
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFisetup();
  //WiFi.begin(ssid1, password1);
  delay(1000);
  if (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.println("Failed connected setup ");
  }
  else{
  Serial.println("");
  Serial.println("WiFi OK connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  // We start by connecting to a WiFi network
  }
}
int value = 0;
void serverloop()
{
    delay(1000);
     ++value;
    data1 = String(data1);
    data2 = String(data2);
    //AM2302_loop();
    //data3 = temp_0;
    //data4 = humid_0;
    Serial.print("data1 rain mm = ");Serial.println(data1);
    Serial.print("data2 soil    = ");Serial.println(data2);
    Serial.print("data3 temp    = ");Serial.println(data3);
    Serial.print("data4 humid   = ");Serial.println(data4);
    Serial.print("connecting to ");
    Serial.println(host);
    // Use WiFiClient class to create TCP connections
    WiFiClient client;
    const int httpPort = 80;
    if (!client.connect(host, httpPort)) {
        Serial.println("connection failed");
        return;
    }
    // We now create a URI for the request
     String url = "/api/insertData?device_id=" + String(dID)+"&code="+String(code)+"&data1=" +String(data1) +"&data2="
   + String(data2)+"&data3=" +String(data3)+"&data4=" +String(data4)+"&data5=" +String(data5)
   +"&data6=" +String(data6)+"&data7=" +String(data7)+"&data8=" +String(data8)+"&data9=" +String(data9)
   +"&data10=" +String(data10)+"&data11=" +String(data11)+"&data12=" +String(data12)+"&data13=" +String(data13)
   +"&data14=" +String(data14)+"&data15=" +String(data15)+"&data16=" +String(data16)+"&data17=" +String(data17)
   +"&data18=" +String(data18)+"&data19=" +String(data19)+"&data20=" +String(data20);
    Serial.print("Requesting URL: ");
    Serial.println(url);
    // This will send the request to the server
    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" +
                 "Connection: close\r\n\r\n");
    //unsigned long timeout = millis();
    delay(1000);
    while (client.available() == 0) {
            Serial.println(">>> Client Timeout !");
            client.stop();
            return;
           }
    // Read all the lines of the reply from server and print them to Serial
    while(client.available()) {
        String line = client.readStringUntil('\r');
        //Serial.print(line);  ถอดคอมเม้น? ออก เพื่อดูการตอบสนองจาก Server
    }
    Serial.println();
    Serial.println("endloop server ");
    delay(1000);
}
//====
void loop()
{
    if (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.println("Failed to connected and WiFi setup ");
        WiFisetup();
    }
  serial_loop();
  serverloop();
  data1 = "";
  data2 = "";
}
void serial_loop()
{
Serial.println("Please wait Serial..");
/// #1
  while (a == "") {
    Serial2.print("Input1"); // ส่งหัวข้อคำถาม ว่า Question1 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 1 ");Serial.println(a);
  data1 = String(a);
  delay(1000);
  a="";
///#2
  while (a == "") {
    Serial2.print("Input2"); // ส่งหัวข้อคำถาม ว่า Question1 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 2 ");Serial.println(a);
  data2=String(a);
  a="";
///#3
    while (a == "") {
    Serial2.print("Input3"); // ส่งหัวข้อคำถาม ว่า Question1 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 3 ");Serial.println(a);
  data3 = String(a);
  delay(1000);
  a="";
///#4
  while (a == "") {
    Serial2.print("Input4"); // ส่งหัวข้อคำถาม ว่า Question1 ไปยัง Arduino
    a = Serial2.readString();  // อ่าน Serial และนำไปเก็บในตัวแปร A
    delay(100);
    Serial.print(".");
  }
  Serial.print(" Answer 4 ");Serial.println(a);
  data4=String(a);
  a="";
}

สำหรับฝั่ง  Nano  จะเป็นเหมือนกับตัวอย่างก่อนที่มีการต่อกับ ESP8266
โดยในฝั่ง  Nano  ยังคงประการใช้ SoftwareSerial ตามปกติ

#include <EEPROM.h>
#include <SoftwareSerial.h>
SoftwareSerial chat(10, 11); // RX, TX
////////  AM2302
#include <SHT1x.h>
#define dataPin  A4
#define clockPin A5
SHT1x sht1x(dataPin, clockPin);
int ledPin = 2;
int ledPin3 = 3;
int analogPin = A1;
int val = 0;
////
#include <math.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>  // กรณีนี้ต้องใช้คู่กันกับ  DHT_U.h
#include <DHT_U.h>
#define DHTPIN 6 // Pin which is connected to the DHT sensor.
// Uncomment the type of sensor in use:
//#define DHTTYPE           DHT11     // DHT 11
#define DHTTYPE           DHT22     // DHT 22 (AM2302)
//#define DHTTYPE           DHT21     // DHT 21 (AM2301)
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;
////////
int i;
int sensorValue;
float rainmm ;
float dustDensity = 35;
String response ="0";
String response_c = "0";
String a ;
float temp_0 = 0;
float tempF_0 = 0;
float humid_0 = 0;
float vHumidity = 0;
float vTemperature = 0;
String data1 ;
String data2 ; // standard
float data3 = 0;
float data4 = 0;
float data5 = 0;
float data6 = 0;
float data7 = 0;
float data8 = 0;
float data9 = 0;
float data10 = 0;
float data11 = 0;
float data12 = 0;
float data13 = 0;
float data14 = 0;
float data15 = 0;
float data16 = 0;
float data17 = 0;
float data18 = 0;
float data19 = 0;
float data20 = 0;
float temperatureC = 0;
float temperatureF = 0;
int counter = 1;
int sentcount = 0;
//////////////////////////////
void AM2302_setup() {
  dht.begin();
  Serial.println("DHTxx Unified Sensor Example");
  // Print temperature sensor details.
  sensor_t sensor;
  dht.temperature().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Temperature");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println(" *C");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println(" *C");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println(" *C");
  Serial.println("------------------------------------");
  // Print humidity sensor details.
  dht.humidity().getSensor(&sensor);
  Serial.println("------------------------------------");
  Serial.println("Humidity");
  Serial.print  ("Sensor:       "); Serial.println(sensor.name);
  Serial.print  ("Driver Ver:   "); Serial.println(sensor.version);
  Serial.print  ("Unique ID:    "); Serial.println(sensor.sensor_id);
  Serial.print  ("Max Value:    "); Serial.print(sensor.max_value); Serial.println("%");
  Serial.print  ("Min Value:    "); Serial.print(sensor.min_value); Serial.println("%");
  Serial.print  ("Resolution:   "); Serial.print(sensor.resolution); Serial.println("%");
  Serial.println("------------------------------------");
  // Set delay between sensor readings based on sensor details.
  delayMS = sensor.min_delay / 1000;
}
void setup()  {
  Serial.begin(9600);
  chat.begin(4800);
  pinMode(ledPin, OUTPUT); // sets the pin as output
  pinMode(ledPin3, OUTPUT); // sets the pin as output
}
void loop() {
  //AM2302_loop();
  sht1_loop();
  input1_loop();
  input2_loop();
  if (chat.readString()){
     // chat.print(1);
     if(chat.readString()== "Input1"){ //มีการถามคำถาม Question1 ส่งข้อมูลตัวแปร a ออกไป
      chat.print(String(sensorValue));
     }
     if(chat.readString()== "Input2"){ //มีการถามคำถาม Question2 ส่งข้อมูลตัวแปร b ออกไป
     chat.print(String(rainmm));
     }
     if(chat.readString()== "Input3"){ //มีการถามคำถาม Question1 ส่งข้อมูลตัวแปร a ออกไป
      chat.print(String(data3));
     }
     if(chat.readString()== "Input4"){ //มีการถามคำถาม Question2 ส่งข้อมูลตัวแปร b ออกไป
     chat.print(String(data4));
     }
     Serial.print("Send = ");
     Serial.println(i);
  }
  i++;
  delay(1000);
}
void input1_loop() {
  // read the value from the sensor:
  sensorValue = analogRead(A0);
  //Serial.print(" Analog read := ");Serial.println(sensorValue);
  if (sensorValue > 580) {
    rainmm = 80.437-0.0977*sensorValue;
  }
  else {
    if (sensorValue > 509) {
      rainmm = 443.6-0.717*sensorValue;
    }
    else
    {
      if (sensorValue > 466) {
        rainmm = 903.74-1.6059*sensorValue;
      }
      else{
      rainmm = 770.06-1.3314*sensorValue;
      }
    }
  }
  delay(1000);
  //answer=String(255);
  Serial.print("A0 signal : ");Serial.println(sensorValue);
  Serial.print("Rain mm : ");Serial.println(rainmm);
}
void input2_loop() {
  // read the value from the sensor:
  sensorValue = analogRead(A0);
  //Serial.print(" Analog read := ");Serial.println(sensorValue);
  if (sensorValue > 580) {
    rainmm = 80.437-0.0977*sensorValue;
  }
  else {
    if (sensorValue > 509) {
      rainmm = 443.6-0.717*sensorValue;
    }
    else
    {
      if (sensorValue > 466) {
        rainmm = 903.74-1.6059*sensorValue;
      }
      else{
      rainmm = 770.06-1.3314*sensorValue;
      }
    }
  }
  delay(1000);
  //answer=String(255);
}
void AM2302_loop() {
  // Delay between measurements.
  delay(delayMS);
  // Get temperature event and print its value.
  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (isnan(event.temperature)) {
    Serial.println("Error reading temperature!");
  }
  else {
    Serial.print("Temperature: ");
    Serial.print(event.temperature);
    Serial.println(" *C");
    temp_0 = event.temperature;
    data3 = temp_0;
  }
  // Get humidity event and print its value.
  dht.humidity().getEvent(&event);
  if (isnan(event.relative_humidity)) {
    Serial.println("Error reading humidity!");
  }
  else {
    Serial.print("Humidity: ");
    Serial.print(event.relative_humidity);
    Serial.println("%");
    humid_0 = event.relative_humidity;
    data4 = humid_0;
  }
}
void sht1_loop()  // from myarduino.net
{
  float temp_c; // ค่าอุณหภูมิ ที่แสดงหน่วยเป็น องศาเซลเซียส
  float temp_f; // ค่าอุณหภูมิ ที่แสดงหน่วยเป็น องศาฟาเรนไฮต์
  float humidity; // ค่าความชื้น
  temp_c = sht1x.readTemperatureC();
  temp_f = sht1x.readTemperatureF();
  humidity = sht1x.readHumidity();
  data3 = temp_c;
  data4 = humidity;
  Serial.print("Temperature: ");
  Serial.print(temp_c, DEC);
  Serial.print("C / ");
  Serial.print(temp_f, DEC);
  Serial.print("F. Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
  if (temp_c < 25  ) { // ค่าที่กำหนดไว้เพื่อให้วงจร LED ทำงาน ในที่นี้กำหนดการทำงานเมื่อค่าอุณหภูมิ ที่แสดงหน่วยเป็น องศาเซลเซียส ต่ำกว่า 25
    digitalWrite(ledPin, LOW); // สั่งให้ LED ที่ Pin2 ดับ
    digitalWrite(ledPin3, HIGH); // สั่งให้ LED ที่ Pin3 ติดสว่าง
  }
  else {
    digitalWrite(ledPin, HIGH); // สั่งให้ LED ที่ Pin2 ติดสว่าง
    digitalWrite(ledPin3, LOW); // สั่งให้ LED ที่ Pin3 ดับ
  }
  delay(100);
}

ขอบคุณโค้ด  SHT1  จาก  myarduino.net

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